AL300 datasheet(49/64 Pages) ETC

49 / 64 page

AL300

November 28, 2001

When LinePosDetect is 1, the horizontal line used to detect horizontal active

start and end is defined in register 70h, and the vertical column used to

detect vertical active start and end is defined in register 79h.

Values of register #72h~#75h reflect the detected input active pixels start/end positions or the GHREF

signal star/end positions, depending on the status of register #82h<7:6>.

72h:

Horizontal Active Start Low (R only) [HDESTART]

HDEStartL

<7:0> Bits <7:0> of detected horizontal active start pixel position. (Unit: 1 pixel)

73h:

Horizontal Active Start High (R only) [HDESTART]

HDEStartH

<2:0> Bits <10:8> of detected horizontal active start pixel position.

74h:

Horizontal Active End Low (R only) [HDEEND]

HDEEndL

<7:0> Bits <7:0> of detected horizontal active end pixel position (Unit: 1 pixel)

75h:

Horizontal Active End High (R only) [HDEEND]

HDEEndH

<2:0> Bits <10:8> of detected horizontal active end pixel position.

79h:

Vertical Column for VDESTART & VDEEND detection (R/W) [VCOLUMN]

VColumn

<7:0> Vertical column number for vertical active start and end detection; refer to

7Ah:

Vertical Active Start Low (R only) [VDESTART]

VDEStartL

<7:0> Bits <7:0> of detected vertical active start line (Unit: 1 line)

7Bh:

Vertical Active Start High (R only) [VDESTART]

VDEStartH

<2:0> Bits <10:8> of detected vertical active start line

7Ch:

Vertical Active End Low (R only) [VDEEND]

VDEEndL

<7:0> Bits <7:0> of detected vertical active end line (Unit: 1 line)

7Dh:

Vertical Active End High (R only) [VDEEND]

VDEEndH

<2:0> Bits <10:8> of detected vertical active end line

OSD Control:

80h:

OSD Modes (R/W) [OSDMODE]

RomMode

<0>

Enable ROM mode

Internal RAM mode

External ROM mode

This bit should be 0 when OSD1 and OSD2 are both disabled.

BypassHPos

<5>

The output horizontal start/end position is defined by register #33h &

#34h, which resolution is 8-pixel.

the output horizontal start/end position is defined by registers

#20h~22h

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